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How we describe some atoms that are unstable. They change into different kinds of atoms and release lots of energy.

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The constant stream of particles and energy emitted by the sun.

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A vehicle used for traveling in space.

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A mountain or hill that has an opening where lava, rock fragments, or gas erupt from deep inside a planet or moon.

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A part of Earth’s atmosphere that absorbs lots of the sun’s ultraviolet radiation. It is made of a gas called ozone, which is a molecule of three oxygen atoms.

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The curved path that a planet, satellite, or spacecraft moves as it circles around another object.

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Radiation with lots of energy made by very hot gases, stars, neutron stars, and gas around black holes. X-rays have so much energy they can pass though solid materials.

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The part of the electromagnetic spectrum that we can see with our eyes. It’s all the colors of the rainbow.

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An object that orbits another object. A moon is actually a satellite. We also say satellite to refer to spacecraft people build that orbit Earth, other planets,

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All of space and time, and everything in it. It’s everything ever!

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A planet that freely floats between stars or one that orbits a star outside our solar system.

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The universe seen as an orderly, harmonious whole.

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It’s not a year, or an amount of time at all. It’s the distance light travels in one year. It’s the same as 5,878,499,810,000 miles (or 9,460,538,400,000,000 meters). When things are very far away, it’s easier to talk about their distance in light years than millions or billions or trillions of miles

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The explosion of a star that makes it as bright as a whole galaxy.

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Rocks floating around in space. Some are the size of a pick-up truck. Others are hundreds of miles across.

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An icy rock that lets off gas and dust, which may form tails when it is flying close to a sun.

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The gases held by gravity around Earth and around other planets. "Atmosphere" can also be used to talk about gases around stars.

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A collection of thousands to billions of stars held together by gravity. The galaxy we live in is called the Milky Way.

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A place in space where matter and light cannot escape if they fall in.

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A force that pulls matter together.